Babylon.js/sandbox/src/globalState.ts

import { Observable } from 'babylonjs/Misc/observable';
import { Scene } from 'babylonjs/scene';
import { FilesInput } from 'babylonjs/Misc/filesInput';

export class GlobalState {
    currentScene: Scene;
    onSceneLoaded = new Observable<{scene: Scene, filename: string}>();
    onError = new Observable<{scene?: Scene, message?: string}>();
    onEnvironmentChanged = new Observable<string>();    
    onRequestClickInterceptor = new Observable<void>();
    onClickInterceptorClicked = new Observable<void>();

    filesInput: FilesInput;
    isDebugLayerEnabled = false;

    public showDebugLayer() {
        this.isDebugLayerEnabled = true;
        if (this.currentScene) {
            this.currentScene.debugLayer.show();
        }    
    }

    public hideDebugLayer() {
        this.isDebugLayerEnabled = false;
        if (this.currentScene) {
            this.currentScene.debugLayer.hide();
        }     
    }
}